题文
(1)![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/201209010922117953374.png)
.
(2)3+50÷2×(-![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092211866599.png)
)-1.
(3)25×![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/201209010922120123029.png)
.
(4)[1-(1-0.5×![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092212084582.png)
)]×[2-(-3)2].
题型:未知 难度:其他题型
答案
解:(1)原式=3![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092212155582.png)
+2![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092212227589.png)
﹣![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092212298580.png)
﹣![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092212369587.png)
﹣![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092212441618.png)
=3![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092212512580.png)
+2﹣![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092212586580.png)
﹣![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092212657618.png)
=3![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092212728580.png)
+2﹣![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092212799580.png)
=5;
(2)原式=3-50×![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/201209010922128821143.png)
-1
=3-2![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092212953580.png)
-1
=-![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092213023580.png)
;
(3)原式=![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092213099844.png)
+![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092213176879.png)
﹣![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092213253874.png)
=![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092213330879.png)
+![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092213407879.png)
=25;
(4)原式=[1-1+![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092213478607.png)
] ×[2-9]
=![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092213549607.png)
×(-7)
=-![.3+50÷2×-1.25×.[1-]×[2-2]. .3+50÷2×-1.25×.[1-]×[2-2].](https://www.mshxw.com/file/tupian/20211123/20120901092213621640.png)
.
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解析
该题暂无解析
考点
据考高分专家说,试题“(1).(2)3+50÷2×(-).....”主要考查你对 [有理数的混合运算 ]考点的理解。
有理数的混合运算
有理数的混合运算:
是一个运算式子中有加有减有乘有除有次方等运算方式的混合运算方式。
有理数混合运算的规律:
(1)先乘方,再乘除,最后加减;
(2)同级运算,从左到右进行;
(3)若有括号,先做括号内的运算,按小括号、中括号、大括号依次进行计算。


